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Question

Solve:
$18 - (- 20) + (- 30) + 20$

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Solution

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$18 - (- 20) + (- 30) + 20$
$= 18 + 20 - 30 + 20$
$= 18 + 20 + 20 - 30$
$= 58 - 30$
$= 28$

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